“All the police started coming in and saying ‘hold it.’ And they said ‘stop processing.’ They were telling all the guys who work there,” a man who had just returned from the Dominican Republic told Haskell.

“Extremely frustrating, especially since the directions were not clear at first. When they were clear, most people weren’t following them,” said a man who had just arrived after a 13-hour flight from Dubai.

The arrivals area of Terminal 4 remained roped off as of 5:30 p.m., Haskell reported.

The man reportedly told authorities the grenade was inert but the area was evacuated as a precaution.